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Filename Latest commit message Latest commit date
Shin'ichiro Kawasaki 26b3901d20 btrfs: fix deadlock between quota disable and qgroup rescan worker 
commit e804861bd4e69cc5fe1053eedcb024982dde8e48 upstream.

Quota disable ioctl starts a transaction before waiting for the qgroup
rescan worker completes. However, this wait can be infinite and results
in deadlock because of circular dependency among the quota disable
ioctl, the qgroup rescan worker and the other task with transaction such
as block group relocation task.

The deadlock happens with the steps following:

1) Task A calls ioctl to disable quota. It starts a transaction and
   waits for qgroup rescan worker completes.
2) Task B such as block group relocation task starts a transaction and
   joins to the transaction that task A started. Then task B commits to
   the transaction. In this commit, task B waits for a commit by task A.
3) Task C as the qgroup rescan worker starts its job and starts a
   transaction. In this transaction start, task C waits for completion
   of the transaction that task A started and task B committed.

This deadlock was found with fstests test case btrfs/115 and a zoned
null_blk device. The test case enables and disables quota, and the
block group reclaim was triggered during the quota disable by chance.
The deadlock was also observed by running quota enable and disable in
parallel with 'btrfs balance' command on regular null_blk devices.

An example report of the deadlock:

  [372.469894] INFO: task kworker/u16:6:103 blocked for more than 122 seconds.
  [372.479944]       Not tainted 5.16.0-rc8 #7
  [372.485067] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
  [372.493898] task:kworker/u16:6   state:D stack:    0 pid:  103 ppid:     2 flags:0x00004000
  [372.503285] Workqueue: btrfs-qgroup-rescan btrfs_work_helper [btrfs]
  [372.510782] Call Trace:
  [372.514092]  <TASK>
  [372.521684]  __schedule+0xb56/0x4850
  [372.530104]  ? io_schedule_timeout+0x190/0x190
  [372.538842]  ? lockdep_hardirqs_on+0x7e/0x100
  [372.547092]  ? _raw_spin_unlock_irqrestore+0x3e/0x60
  [372.555591]  schedule+0xe0/0x270
  [372.561894]  btrfs_commit_transaction+0x18bb/0x2610 [btrfs]
  [372.570506]  ? btrfs_apply_pending_changes+0x50/0x50 [btrfs]
  [372.578875]  ? free_unref_page+0x3f2/0x650
  [372.585484]  ? finish_wait+0x270/0x270
  [372.591594]  ? release_extent_buffer+0x224/0x420 [btrfs]
  [372.599264]  btrfs_qgroup_rescan_worker+0xc13/0x10c0 [btrfs]
  [372.607157]  ? lock_release+0x3a9/0x6d0
  [372.613054]  ? btrfs_qgroup_account_extent+0xda0/0xda0 [btrfs]
  [372.620960]  ? do_raw_spin_lock+0x11e/0x250
  [372.627137]  ? rwlock_bug.part.0+0x90/0x90
  [372.633215]  ? lock_is_held_type+0xe4/0x140
  [372.639404]  btrfs_work_helper+0x1ae/0xa90 [btrfs]
  [372.646268]  process_one_work+0x7e9/0x1320
  [372.652321]  ? lock_release+0x6d0/0x6d0
  [372.658081]  ? pwq_dec_nr_in_flight+0x230/0x230
  [372.664513]  ? rwlock_bug.part.0+0x90/0x90
  [372.670529]  worker_thread+0x59e/0xf90
  [372.676172]  ? process_one_work+0x1320/0x1320
  [372.682440]  kthread+0x3b9/0x490
  [372.687550]  ? _raw_spin_unlock_irq+0x24/0x50
  [372.693811]  ? set_kthread_struct+0x100/0x100
  [372.700052]  ret_from_fork+0x22/0x30
  [372.705517]  </TASK>
  [372.709747] INFO: task btrfs-transacti:2347 blocked for more than 123 seconds.
  [372.729827]       Not tainted 5.16.0-rc8 #7
  [372.745907] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
  [372.767106] task:btrfs-transacti state:D stack:    0 pid: 2347 ppid:     2 flags:0x00004000
  [372.787776] Call Trace:
  [372.801652]  <TASK>
  [372.812961]  __schedule+0xb56/0x4850
  [372.830011]  ? io_schedule_timeout+0x190/0x190
  [372.852547]  ? lockdep_hardirqs_on+0x7e/0x100
  [372.871761]  ? _raw_spin_unlock_irqrestore+0x3e/0x60
  [372.886792]  schedule+0xe0/0x270
  [372.901685]  wait_current_trans+0x22c/0x310 [btrfs]
  [372.919743]  ? btrfs_put_transaction+0x3d0/0x3d0 [btrfs]
  [372.938923]  ? finish_wait+0x270/0x270
  [372.959085]  ? join_transaction+0xc75/0xe30 [btrfs]
  [372.977706]  start_transaction+0x938/0x10a0 [btrfs]
  [372.997168]  transaction_kthread+0x19d/0x3c0 [btrfs]
  [373.013021]  ? btrfs_cleanup_transaction.isra.0+0xfc0/0xfc0 [btrfs]
  [373.031678]  kthread+0x3b9/0x490
  [373.047420]  ? _raw_spin_unlock_irq+0x24/0x50
  [373.064645]  ? set_kthread_struct+0x100/0x100
  [373.078571]  ret_from_fork+0x22/0x30
  [373.091197]  </TASK>
  [373.105611] INFO: task btrfs:3145 blocked for more than 123 seconds.
  [373.114147]       Not tainted 5.16.0-rc8 #7
  [373.120401] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
  [373.130393] task:btrfs           state:D stack:    0 pid: 3145 ppid:  3141 flags:0x00004000
  [373.140998] Call Trace:
  [373.145501]  <TASK>
  [373.149654]  __schedule+0xb56/0x4850
  [373.155306]  ? io_schedule_timeout+0x190/0x190
  [373.161965]  ? lockdep_hardirqs_on+0x7e/0x100
  [373.168469]  ? _raw_spin_unlock_irqrestore+0x3e/0x60
  [373.175468]  schedule+0xe0/0x270
  [373.180814]  wait_for_commit+0x104/0x150 [btrfs]
  [373.187643]  ? test_and_set_bit+0x20/0x20 [btrfs]
  [373.194772]  ? kmem_cache_free+0x124/0x550
  [373.201191]  ? btrfs_put_transaction+0x69/0x3d0 [btrfs]
  [373.208738]  ? finish_wait+0x270/0x270
  [373.214704]  ? __btrfs_end_transaction+0x347/0x7b0 [btrfs]
  [373.222342]  btrfs_commit_transaction+0x44d/0x2610 [btrfs]
  [373.230233]  ? join_transaction+0x255/0xe30 [btrfs]
  [373.237334]  ? btrfs_record_root_in_trans+0x4d/0x170 [btrfs]
  [373.245251]  ? btrfs_apply_pending_changes+0x50/0x50 [btrfs]
  [373.253296]  relocate_block_group+0x105/0xc20 [btrfs]
  [373.260533]  ? mutex_lock_io_nested+0x1270/0x1270
  [373.267516]  ? btrfs_wait_nocow_writers+0x85/0x180 [btrfs]
  [373.275155]  ? merge_reloc_roots+0x710/0x710 [btrfs]
  [373.283602]  ? btrfs_wait_ordered_extents+0xd30/0xd30 [btrfs]
  [373.291934]  ? kmem_cache_free+0x124/0x550
  [373.298180]  btrfs_relocate_block_group+0x35c/0x930 [btrfs]
  [373.306047]  btrfs_relocate_chunk+0x85/0x210 [btrfs]
  [373.313229]  btrfs_balance+0x12f4/0x2d20 [btrfs]
  [373.320227]  ? lock_release+0x3a9/0x6d0
  [373.326206]  ? btrfs_relocate_chunk+0x210/0x210 [btrfs]
  [373.333591]  ? lock_is_held_type+0xe4/0x140
  [373.340031]  ? rcu_read_lock_sched_held+0x3f/0x70
  [373.346910]  btrfs_ioctl_balance+0x548/0x700 [btrfs]
  [373.354207]  btrfs_ioctl+0x7f2/0x71b0 [btrfs]
  [373.360774]  ? lockdep_hardirqs_on_prepare+0x410/0x410
  [373.367957]  ? lockdep_hardirqs_on_prepare+0x410/0x410
  [373.375327]  ? btrfs_ioctl_get_supported_features+0x20/0x20 [btrfs]
  [373.383841]  ? find_held_lock+0x2c/0x110
  [373.389993]  ? lock_release+0x3a9/0x6d0
  [373.395828]  ? mntput_no_expire+0xf7/0xad0
  [373.402083]  ? lock_is_held_type+0xe4/0x140
  [373.408249]  ? vfs_fileattr_set+0x9f0/0x9f0
  [373.414486]  ? selinux_file_ioctl+0x349/0x4e0
  [373.420938]  ? trace_raw_output_lock+0xb4/0xe0
  [373.427442]  ? selinux_inode_getsecctx+0x80/0x80
  [373.434224]  ? lockdep_hardirqs_on+0x7e/0x100
  [373.440660]  ? force_qs_rnp+0x2a0/0x6b0
  [373.446534]  ? lock_is_held_type+0x9b/0x140
  [373.452763]  ? __blkcg_punt_bio_submit+0x1b0/0x1b0
  [373.459732]  ? security_file_ioctl+0x50/0x90
  [373.466089]  __x64_sys_ioctl+0x127/0x190
  [373.472022]  do_syscall_64+0x3b/0x90
  [373.477513]  entry_SYSCALL_64_after_hwframe+0x44/0xae
  [373.484823] RIP: 0033:0x7f8f4af7e2bb
  [373.490493] RSP: 002b:00007ffcbf936178 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
  [373.500197] RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00007f8f4af7e2bb
  [373.509451] RDX: 00007ffcbf936220 RSI: 00000000c4009420 RDI: 0000000000000003
  [373.518659] RBP: 00007ffcbf93774a R08: 0000000000000013 R09: 00007f8f4b02d4e0
  [373.527872] R10: 00007f8f4ae87740 R11: 0000000000000246 R12: 0000000000000001
  [373.537222] R13: 00007ffcbf936220 R14: 0000000000000000 R15: 0000000000000002
  [373.546506]  </TASK>
  [373.550878] INFO: task btrfs:3146 blocked for more than 123 seconds.
  [373.559383]       Not tainted 5.16.0-rc8 #7
  [373.565748] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
  [373.575748] task:btrfs           state:D stack:    0 pid: 3146 ppid:  2168 flags:0x00000000
  [373.586314] Call Trace:
  [373.590846]  <TASK>
  [373.595121]  __schedule+0xb56/0x4850
  [373.600901]  ? __lock_acquire+0x23db/0x5030
  [373.607176]  ? io_schedule_timeout+0x190/0x190
  [373.613954]  schedule+0xe0/0x270
  [373.619157]  schedule_timeout+0x168/0x220
  [373.625170]  ? usleep_range_state+0x150/0x150
  [373.631653]  ? mark_held_locks+0x9e/0xe0
  [373.637767]  ? do_raw_spin_lock+0x11e/0x250
  [373.643993]  ? lockdep_hardirqs_on_prepare+0x17b/0x410
  [373.651267]  ? _raw_spin_unlock_irq+0x24/0x50
  [373.657677]  ? lockdep_hardirqs_on+0x7e/0x100
  [373.664103]  wait_for_completion+0x163/0x250
  [373.670437]  ? bit_wait_timeout+0x160/0x160
  [373.676585]  btrfs_quota_disable+0x176/0x9a0 [btrfs]
  [373.683979]  ? btrfs_quota_enable+0x12f0/0x12f0 [btrfs]
  [373.691340]  ? down_write+0xd0/0x130
  [373.696880]  ? down_write_killable+0x150/0x150
  [373.703352]  btrfs_ioctl+0x3945/0x71b0 [btrfs]
  [373.710061]  ? find_held_lock+0x2c/0x110
  [373.716192]  ? lock_release+0x3a9/0x6d0
  [373.722047]  ? __handle_mm_fault+0x23cd/0x3050
  [373.728486]  ? btrfs_ioctl_get_supported_features+0x20/0x20 [btrfs]
  [373.737032]  ? set_pte+0x6a/0x90
  [373.742271]  ? do_raw_spin_unlock+0x55/0x1f0
  [373.748506]  ? lock_is_held_type+0xe4/0x140
  [373.754792]  ? vfs_fileattr_set+0x9f0/0x9f0
  [373.761083]  ? selinux_file_ioctl+0x349/0x4e0
  [373.767521]  ? selinux_inode_getsecctx+0x80/0x80
  [373.774247]  ? __up_read+0x182/0x6e0
  [373.780026]  ? count_memcg_events.constprop.0+0x46/0x60
  [373.787281]  ? up_write+0x460/0x460
  [373.792932]  ? security_file_ioctl+0x50/0x90
  [373.799232]  __x64_sys_ioctl+0x127/0x190
  [373.805237]  do_syscall_64+0x3b/0x90
  [373.810947]  entry_SYSCALL_64_after_hwframe+0x44/0xae
  [373.818102] RIP: 0033:0x7f1383ea02bb
  [373.823847] RSP: 002b:00007fffeb4d71f8 EFLAGS: 00000202 ORIG_RAX: 0000000000000010
  [373.833641] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f1383ea02bb
  [373.842961] RDX: 00007fffeb4d7210 RSI: 00000000c0109428 RDI: 0000000000000003
  [373.852179] RBP: 0000000000000003 R08: 0000000000000003 R09: 0000000000000078
  [373.861408] R10: 00007f1383daec78 R11: 0000000000000202 R12: 00007fffeb4d874a
  [373.870647] R13: 0000000000493099 R14: 0000000000000001 R15: 0000000000000000
  [373.879838]  </TASK>
  [373.884018]
               Showing all locks held in the system:
  [373.894250] 3 locks held by kworker/4:1/58:
  [373.900356] 1 lock held by khungtaskd/63:
  [373.906333]  #0: ffffffff8945ff60 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260
  [373.917307] 3 locks held by kworker/u16:6/103:
  [373.923938]  #0: ffff888127b4f138 ((wq_completion)btrfs-qgroup-rescan){+.+.}-{0:0}, at: process_one_work+0x712/0x1320
  [373.936555]  #1: ffff88810b817dd8 ((work_completion)(&work->normal_work)){+.+.}-{0:0}, at: process_one_work+0x73f/0x1320
  [373.951109]  #2: ffff888102dd4650 (sb_internal#2){.+.+}-{0:0}, at: btrfs_qgroup_rescan_worker+0x1f6/0x10c0 [btrfs]
  [373.964027] 2 locks held by less/1803:
  [373.969982]  #0: ffff88813ed56098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x24/0x80
  [373.981295]  #1: ffffc90000b3b2e8 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x9e2/0x1060
  [373.992969] 1 lock held by btrfs-transacti/2347:
  [373.999893]  #0: ffff88813d4887a8 (&fs_info->transaction_kthread_mutex){+.+.}-{3:3}, at: transaction_kthread+0xe3/0x3c0 [btrfs]
  [374.015872] 3 locks held by btrfs/3145:
  [374.022298]  #0: ffff888102dd4460 (sb_writers#18){.+.+}-{0:0}, at: btrfs_ioctl_balance+0xc3/0x700 [btrfs]
  [374.034456]  #1: ffff88813d48a0a0 (&fs_info->reclaim_bgs_lock){+.+.}-{3:3}, at: btrfs_balance+0xfe5/0x2d20 [btrfs]
  [374.047646]  #2: ffff88813d488838 (&fs_info->cleaner_mutex){+.+.}-{3:3}, at: btrfs_relocate_block_group+0x354/0x930 [btrfs]
  [374.063295] 4 locks held by btrfs/3146:
  [374.069647]  #0: ffff888102dd4460 (sb_writers#18){.+.+}-{0:0}, at: btrfs_ioctl+0x38b1/0x71b0 [btrfs]
  [374.081601]  #1: ffff88813d488bb8 (&fs_info->subvol_sem){+.+.}-{3:3}, at: btrfs_ioctl+0x38fd/0x71b0 [btrfs]
  [374.094283]  #2: ffff888102dd4650 (sb_internal#2){.+.+}-{0:0}, at: btrfs_quota_disable+0xc8/0x9a0 [btrfs]
  [374.106885]  #3: ffff88813d489800 (&fs_info->qgroup_ioctl_lock){+.+.}-{3:3}, at: btrfs_quota_disable+0xd5/0x9a0 [btrfs]

  [374.126780] =============================================

To avoid the deadlock, wait for the qgroup rescan worker to complete
before starting the transaction for the quota disable ioctl. Clear
BTRFS_FS_QUOTA_ENABLE flag before the wait and the transaction to
request the worker to complete. On transaction start failure, set the
BTRFS_FS_QUOTA_ENABLE flag again. These BTRFS_FS_QUOTA_ENABLE flag
changes can be done safely since the function btrfs_quota_disable is not
called concurrently because of fs_info->subvol_sem.

Also check the BTRFS_FS_QUOTA_ENABLE flag in qgroup_rescan_init to avoid
another qgroup rescan worker to start after the previous qgroup worker
completed.

CC: stable@vger.kernel.org # 5.4+
Suggested-by: Nikolay Borisov <nborisov@suse.com>
Reviewed-by: Filipe Manana <fdmanana@suse.com>
Signed-off-by: Shin'ichiro Kawasaki <shinichiro.kawasaki@wdc.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2022-02-08 18:24:28 +01:00
arch powerpc/32: Fix boot failure with GCC latent entropy plugin 2022-02-01 17:24:36 +01:00
block block: Fix wrong offset in bio_truncate() 2022-02-01 17:24:39 +01:00
certs certs: Trigger creation of RSA module signing key if it's not an RSA key 2021-09-15 09:47:29 +02:00
crypto crypto: pcrypt - Delay write to padata->info 2021-11-17 09:48:40 +01:00
Documentation psi: Fix uaf issue when psi trigger is destroyed while being polled 2022-02-05 12:35:36 +01:00
drivers net: amd-xgbe: Fix skb data length underflow 2022-02-05 12:35:36 +01:00
fs btrfs: fix deadlock between quota disable and qgroup rescan worker 2022-02-08 18:24:28 +01:00
include psi: Fix uaf issue when psi trigger is destroyed while being polled 2022-02-05 12:35:36 +01:00
init
ipc shm: extend forced shm destroy to support objects from several IPC nses 2021-12-01 09:23:35 +01:00
kernel audit: improve audit queue handling when "audit=1" on cmdline 2022-02-08 18:24:26 +01:00
lib lib/test_meminit: destroy cache in kmem_cache_alloc_bulk() test 2022-01-27 09:19:55 +01:00
LICENSES
mm shmem: fix a race between shmem_unused_huge_shrink and shmem_evict_inode 2022-01-27 09:19:29 +01:00
net af_packet: fix data-race in packet_setsockopt / packet_setsockopt 2022-02-05 12:35:37 +01:00
samples samples/kretprobes: Fix return value if register_kretprobe() failed 2021-11-17 09:48:39 +01:00
scripts scripts/dtc: dtx_diff: remove broken example from help text 2022-01-27 09:19:55 +01:00
security selinux: fix potential memleak in selinux_add_opt() 2022-01-27 09:19:35 +01:00
sound ALSA: hda/realtek: Fix silent output on Gigabyte X570 Aorus Xtreme after reboot from Windows 2022-02-08 18:24:27 +01:00
tools perf script: Fix hex dump character output 2022-01-27 09:19:54 +01:00
usr
virt KVM: do not shrink halt_poll_ns below grow_start 2021-10-09 14:39:50 +02:00
.clang-format
.cocciconfig
.get_maintainer.ignore
.gitattributes
.gitignore
.mailmap
COPYING
CREDITS
Kbuild
Kconfig
MAINTAINERS
Makefile Linux 5.4.177 2022-02-05 12:35:37 +01:00
README

README 

Linux kernel
============

There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.  The formatted documentation can also be read online at:

    https://www.kernel.org/doc/html/latest/

There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.